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    <title>Document</title>
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    <script>
        /* 对象的新方法 */
        const person = {
            name: "jack",
            age: 21,
            language: ['java', 'js', 'css']
        }
        //key/values/entries方法
        console.log(Object.keys(person)); // ["name", "age", "language"]
        console.log(Object.values(person)); // ["jack", 21, Array(3)]
        console.log(Object.entries(person)); // [Array(2), Array(2), Array(2)]

        const target = { a: 1 };
        const source1 = { b: 2 };
        const source2 = { c: 3 };

        // assign将源对象的所有可枚举属性复制到目标对象中。
        Object.assign(target, source1, source2);
        console.log(target); // {a:1,b:2,c:3}

        /* 声明对象简写 */
        const age = 23
        const name = "张三"
        //原本声明对象
        const person1 = { age: age, name: name }

        //简写后(若属性名与常量名相同时才可以使用)
        const person2 = { age, name }
        console.log(person2);

        /* 对象函数属性简写 */
        let person3 = {
            name: "jack",
            // 以前：
            eat: function (food) {
                console.log(this.name + "在吃" + food);
            },
            //箭头函数this不能使用，对象.属性
            eat2: food => console.log(person3.name + "在吃" + food),
            eat3(food) {
                console.log(this.name + "在吃" + food);
            }
        }

        person3.eat("苹果")
        person3.eat("香蕉")
        person3.eat("梨子")

        /* 对象扩展运算符 */
        // 1 拷贝对象（深拷贝）
        let p1 = { name: "Amy", age: 15 }
        let someone = { ...p1 }
        console.log(someone)  // {name: "Amy", age: 15}

        // 2 合并对象
        let age1 = { age: 15 }
        let name1 = { name: "Amy" }
        let p2 = { name: "zhangsan" }
        p2 = { ...age1, ...name1 }
        console.log(p2) // {age: 15, name: "Amy"}
    </script>
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